I adopted a seemingly very healthy kitten two months ago. In the last 4 weeks i have had him to the vet 3 times. he's lethargic, his fur is scraggly looking, he doesn't play anymore. He's been running a low fever and was on antibiotics for 10 days, and still has the fever. she doesn't think it's FIP, says that she sees many sickly kittens and puppies that have a rough first year. ANY IDEAS????? Thank you.